Thermal Insulation Behaviors of Rinforced Concrete Composite Wall with Inner Insulating Layer

2010 ◽  
Vol 152-153 ◽  
pp. 395-398
Author(s):  
Shan Zhao ◽  
Feng Lan Li ◽  
Su Yang ◽  
Li Sha Song
Keyword(s):  
Reinforced Concrete ◽  
Heat Resistance ◽  
Thermal Insulation ◽  
Composite Structure ◽  
Test Results ◽  
Insulating Layer ◽  
Bottom Side ◽  
Composite Wall ◽  
Insulation Plate ◽  
Heat Bridge

The new reinforced concrete composite wall (RCCW) with inner insulating layer of polystyrene panel was developed to improve the durability of external thermal insulation plate on walls. The composite structure and construction method of the RCCW is briefly introduced in this paper. The thermal insulation behaviors such as conduct heat coefficient and total heat resistance of RCCW are tested by the protection chest method, the measured and calculated results of thermal insulation properties of the RCCW are compared with each other, the effect of heat-bridge resulted from connected concrete supports of specimen and bottom side concrete of specimen covering inner insulating layer on the test results is discussed.

Thermal Insulation Test of RCCW with Inner Insulating Layer

2010 ◽  
Vol 123-125 ◽  
pp. 843-846
Author(s):  
Shun Bo Zhao ◽  
Shan Zhao ◽  
Su Yang ◽  
Xiao Lu Ma
Keyword(s):  
Reinforced Concrete ◽  
Thermal Insulation ◽  
Concrete Cover ◽  
Test Results ◽  
Insulating Layer ◽  
Composite Wall ◽  
Insulation Plate ◽  
Heat Bridge

To improve the durability of external thermal insulation plate on walls, the new reinforced concrete composite wall(RCCW) with inner insulating layer of polystyrene panel was developed. The paper introduces the thermal insulation tests of the RCCWs by the protection chest method, and studies the method for eliminating the effect of heat-bridge on the test results of conduct heat coefficient of the RCCW. The results show that the test value of conduct heat coefficient of the RCCW was obviously affected by the heat-bridge in specimen caused by the connected concrete such as support and concrete cover around the polystyrene panel, the practical value can be obtained by mean of taking off the percent of heat-bridge effect.

Experimental Study on Thermal Insulation Properties of Reinforced Concrete Composite Wall

2011 ◽  
Vol 99-100 ◽  
pp. 676-679 ◽  
Author(s):  
Shun Bo Zhao ◽  
Su Yang ◽  
Li Sha Song ◽  
Li Sun ◽  
Chen Xiao Song
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Reinforced Concrete ◽  
Thermal Insulation ◽  
Bearing Surface ◽  
Paper Briefly ◽  
Insulating Layer ◽  
Building Envelop ◽  
Composite Wall ◽  
Heat Bridge

The paper briefly introduces the form and construction method of a new reinforced concrete composite wall (RCCW) with inner insulating layer of polystyrene panel. The thermal insulation properties such as heat resistance, heat exchange resistance and heat transfer coefficient of the RCCW were measured by the protection chest method, six specimens in dimensions of 1450mm×1450mm×300mm were cast with the same thickness of prototype walls of building envelop, three kinds of linkages of the RCCW were considered, and two surfaces of the specimen were tested respectively as the heat bearing surface to simulated different heat resources. Based on the tests, the effects of linkages and heat resources on thermal insulation properties of the RCCW are analyzed, some improvements are proposed for reducing the heat-bridge effects as much as possible.

Effect of Different Initial Moisture Contents on the Characteristics of Coupled Heat and Moisture Transfer of a Reinforced Concrete-EPS Thermal Insulation Composite Wall in Harbin

2011 ◽  
Vol 250-253 ◽  
pp. 3044-3049
Author(s):  
Yu Gong Xu ◽  
Mei Lu ◽  
Zi Le Jia
Keyword(s):  
Reinforced Concrete ◽  
Thermal Insulation ◽  
Moisture Transfer ◽  
Heat And Moisture Transfer ◽  
Moisture Contents ◽  
Composite Wall ◽  
Condensed Water ◽  
Coupled Heat And Moisture ◽  
Heat And Moisture ◽  
The Heat Transfer Coefficient

This paper investigated the effect of different initial moisture contents on the characteristics of coupled heat and moisture transfer of a reinforced concrete-EPS thermal insulation composite wall in Harbin. The change of the moisture content with time and the change of the heat transfer coefficient with time of the reinforced concrete-EPS thermal insulation composite wall at different initial moisture contents in Harbin were numerically simulated. The relative humidity and the quantity of condensed water in the air layer of the reinforced concrete-EPS thermal insulation composite wall were also calculated. The paper provides a scientific proof for the influence of the process of construction of a reinforced concrete-EPS thermal insulation composite wall on the energy-saving of buildings.

Testing and Analysis on Thermal Performance for Prefabricated Thermal Insulation Composite Wall Panel of an Office Building

2015 ◽  
Vol 744-746 ◽  
pp. 2314-2317 ◽  
Author(s):  
Zhen Ren ◽  
Rui Li ◽  
Xin Yu Wu ◽  
Li Xin Wang
Keyword(s):  
Temperature Change ◽  
Thermal Insulation ◽  
Thermal Performance ◽  
Building Envelope ◽  
Office Building ◽  
Thermal Imager ◽  
Test Results ◽  
Thermal Bridge ◽  
Composite Wall ◽  
Infrared Thermal Imager

The main objective of this study is to explore prefabricated thermal insulation composite wall’s thermal performance in the project. Using infrared thermal imager and multi-point heat meter takes a test on office building envelope. The test results showed that the composite wall temperature change delay of 3 hours 12 minutes, the temperature change attenuation of 2.5 °C; The composite board exterior wall surface temperature attenuation is larger and the thermal stability of the structure is perfect; thermal bridge is the main reason for reducing the average thermal resistance of the wall.

scholarly journals Seismic Behaviour of Cast-In-Situ Phosphogypsum-Reinforced Concrete Grid Frame Composite Walls

2019 ◽  
Vol 2019 ◽  
pp. 1-17
Author(s):  
Qin Wu ◽  
Huagang Zhang ◽  
Hongniao Chen ◽  
Xin Zhang ◽  
YanHui Wei ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Test Results ◽  
Seismic Behaviour ◽  
Displacement Ductility ◽  
Composite Wall ◽  
Energy Dissipation Capacity ◽  
Composite Walls

This paper mainly studies the effect of cast-in-situ phosphogypsum on seismic behaviour of reinforced concrete grid frame. The mechanical behaviour of three reinforced concrete grid frames and four cast-in-situ phosphogypsum-reinforced concrete grid frame composite walls under low cycle alternating load was designed and tested. The test results show that the reinforced concrete grid frame has less bearing capacity and poor energy consumption. The addition of cast-in-situ phosphogypsum can effectively improve the seismic behaviour of the reinforced concrete grid frame. Compared with the reinforced concrete grid frame, the bearing capacity of the cast-in-situ phosphogypsum-reinforced concrete grid frame composite wall is increased by 2-3 times, the displacement ductility coefficient is increased by 0.95∼1.2 times, and the relative accumulative energy consumption is increased by 86%∼216%. This shows that the composite wall has better bearing capacity, ductility, and energy dissipation capacity.

Study on Thermal Conductivity of Reinforced Concrete Plate

2013 ◽  
Vol 438-439 ◽  
pp. 321-328 ◽  
Author(s):  
Shun Bo Zhao ◽  
Su Yang ◽  
Xue Zhen Feng ◽  
Mei Jun Lu
Keyword(s):  
Thermal Conductivity ◽  
Reinforced Concrete ◽  
Volume Fraction ◽  
Volume Ratio ◽  
Test Results ◽  
Concrete Plate ◽  
Steel Bar ◽  
Building Envelop ◽  
Steel Bars ◽  
Composite Wall

By the heat flow meter method, the thermal conductivity of reinforced concrete was experimental studied for the energy conservation design of reinforced concrete composite wall as building envelop. The steel bars were arranged as horizontal one-way, horizontal two-way and vertical in the reinforced concrete plates with different reinforcement volume ratio. Based on the test results, the effects of arrangement of steel bar and reinforcement volume ratio on thermal conductivity of reinforced concrete were analyzed. It can be concluded that the thermal conductivity of reinforced concrete was higher than that of concrete and increased with the reinforcement volume fraction, the steel bars in horizontal two-way arrangement brought the reinforced concrete with greater thermal conductivity than that in one-way arrangement, the vertical steel bar made the reinforced concrete with significantly higher thermal conductivity. The series-parallel model and parallel-series model are proposed for predicating the thermal conductivity of reinforced concrete with horizontal steel bars.

Adding an expansive agent to increase the toughness of steel fibre reinforced concrete

2019 ◽  
Vol 26 (4) ◽  
pp. 197-208
Author(s):  
Leo Gu Li ◽  
Albert Kwok Hung Kwan
Keyword(s):  
Reinforced Concrete ◽  
Steel Fibre ◽  
The Other ◽  
Fibre Reinforced Concrete ◽  
Test Results ◽  
Compressive Properties ◽  
Shrinkage Cracking ◽  
Steel Fibre Reinforced Concrete ◽  
Expansive Agent ◽  
Concrete Matrix

Previous research studies have indicated that using fibres to improve crack resistance and applying expansive agent (EA) to compensate shrinkage are both effective methods to mitigate shrinkage cracking of concrete, and the additions of both fibres and EA can enhance the other performance attributes of concrete. In this study, an EA was added to fibre reinforced concrete (FRC) to produce concrete mixes with various water/binder (W/B) ratios, steel fibre (SF) contents and EA contents for testing of their workability and compressive properties. The test results showed that adding EA would slightly increase the superplasticiser (SP) demand and decrease the compressive strength, Young’s modulus and Poisson’s ratio, but significantly improve the toughness and specific toughness of the steel FRC produced. Such improvement in toughness may be attributed to the pre-stress of the concrete matrix and the confinement effect of the SFs due to the expansion of the concrete and the restraint of the SFs against such expansion.

On axial compressive behavior of steel fiber reinforced concrete confined by FRP

2021 ◽  
pp. 136943322098165
Author(s):  
Hossein Saberi ◽  
Farzad Hatami ◽  
Alireza Rahai
Keyword(s):  
Reinforced Concrete ◽  
Experimental Test ◽  
Steel Fiber ◽  
Experimental Tests ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Test Results ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Frp Confinement

In this study, the co-effects of steel fibers and FRP confinement on the concrete behavior under the axial compression load are investigated. Thus, the experimental tests were conducted on 18 steel fiber-reinforced concrete (SFRC) specimens confined by FRP. Moreover, 24 existing experimental test results of FRP-confined specimens tested under axial compression are gathered to compile a reliable database for developing a mathematical model. In the conducted experimental tests, the concrete strength was varied as 26 MPa and 32.5 MPa and the steel fiber content was varied as 0.0%, 1.5%, and 3%. The specimens were confined with one and two layers of glass fiber reinforced polymer (GFRP) sheet. The experimental test results show that simultaneously using the steel fibers and FRP confinement in concrete not only significantly increases the peak strength and ultimate strain of concrete but also solves the issue of sudden failure in the FRP-confined concrete. The simulations confirm that the results of the proposed model are in good agreement with those of experimental tests.

Finite Element Analysis of Reinforced Concrete Beams with Exterior FRP Shell

2011 ◽  
Vol 243-249 ◽  
pp. 1461-1465
Author(s):  
Chuan Min Zhang ◽  
Chao He Chen ◽  
Ye Fan Chen
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Contact Interface ◽  
Accurate Calculation ◽  
Element Analysis

The paper makes an analysis of the reinforced concrete beams with exterior FRP Shell in Finite Element, and compares it with the test results. The results show that, by means of this model, mechanical properties of reinforced concrete beams with exterior FRP shell can be predicted better. However, the larger the load, the larger deviation between calculated values and test values. Hence, if more accurate calculation is required, issues of contact interface between the reinforced concrete beams and the FRP shell should be taken into consideration.

scholarly journals Punching Shear Strength of Reinforced Concrete Flat Plates with GFRP Vertical Grids

2021 ◽  
Vol 11 (6) ◽  
pp. 2736
Author(s):  
Min Sook Kim ◽  
Young Hak Lee
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Fiber Reinforced Polymer ◽  
Punching Shear ◽  
Test Results ◽  
Shear Reinforcement ◽  
Flat Plates ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Vertical Grids

In this study, the structural behavior of reinforced concrete flat plates shear reinforced with vertical grids made of a glass fiber reinforced polymer (GFRP) was experimentally evaluated. To examine the shear strength, experiments were performed on nine concrete slabs with different amounts and spacings of shear reinforcement. The test results indicated that the shear strength increased as the amount of shear reinforcement increased and as the spacing of the shear reinforcement decreased. The GFRP shear reinforcement changed the cracks and failure mode of the specimens from a brittle punching to flexure one. In addition, the experimental results are compared with a shear strength equation provided by different concrete design codes. This comparison demonstrates that all of the equations underestimate the shear strength of reinforced concrete flat plates shear reinforced with GFRP vertical grids. The shear strength of the equation by BS 8110 is able to calculate the punching shear strength reasonably for a concrete flat plate shear reinforced with GFRP vertical grids.

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